So what exactly are kefir cultures? It's bacteria which aids digestion - it's actually been used for thousands of years, and used to be made by fermenting grain in animal milk (though coconut milk does just as good a job!)
They do have that 'healthy yoghurt' kinda tang which I'll admit I wasn't overly keen on, I'd definitely add them to juices in future to neutralise it a little. My personal favourite was 'Coconut and Golden Lime' which tasted clean and fresh, followed by the softer 'Pure Coconut' and then 'Coconut, Mango and Passionfruit' (simply not a big mango lover!)
Overall great little nutrition kick for the health conscious, one bottle should keep you topped up for the week, but of course you could have them daily if you wished.